Clutch device for electric winches

ABSTRACT

A clutch device for electric winches comprises: a gear box positioned outside of the gear mechanism of the electric winches; an ring gear settled in the gear box and functions along with the gear mechanism; a plurality of braking recesses provided on the outer surface of the periphery of the ring gear; a breaking port provided on the gear box corresponding to the braking recesses; a detachable clutch sleeve fixed on the braking port; a reversed T shaped clutch lever provided in the sleeve; an elastic element provided on the clutch lever; and a clutch handle provided on the sleeve, which connects with the clutch lever by a connection, wherein, the inner top surface of the clutch handle and the up top surface of the clutch sleeve are cam faces formed by double tapered faces, a rotating-positioning mechanism which can be rotated at 180 degrees provided between the clutch handle and the clutch sleeve. The engaging and disengaging functions between the clutch lever and braking recesses of the ring gear can be realized by the rotation of the clutch handle in clockwise and anticlockwise direction. The construction of the present invention has the simplified construction. The rotation operation is laborsaving, convenient and safe. Operation miss and the lock of the clutch will not be appeared during the usage. It also has longer service life.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a National Stage of International Application No. PCT/CN2007/002423, filed Aug. 13, 2007. This application claims the benefit and priority of Chinese Application No. 200610052982.4, filed Aug. 17, 2006. The entire disclosure of each of the above applications is incorporated herein by reference.

FIELD OF THE INVENTION

The present invention relates to a clutch device for electric winches.

DESCRIPTION OF THE PRIOR ART

Electric brakes pull goods via reeling tight wire rope for self-aid and buddy aid in automobile accidents in the fields. The electric winches are mostly provided with clutch devices while the automobile or the other objects in the accidents is far away from the rescue device and while it is requested that the user can directly pull out wire rope conveniently to hook the accident automobiles during the short period. Chinese Patent No. 01204721.X discloses a braking and its clutch device for electric winches which includes an ring gear settled in a gear box and functions along with the gear mechanism installed in the gear box, a plurality of braking recesses provided on the outer surface of the periphery of the ring gear, a clutch sleeve provided on the braking port of the gear box corresponding to the braking recesses, a reversed T shaped clutch lever with elastic elements provided in the sleeve, and a clutch handle provided above the sleeve. When the wire rope wrapped around the wire rope roll drum is desired to be pulled out, it only needs to pull the handle up then rotate to move a slight angle, so that the clutch lever synchronous with the handle disengages from the braking recesses of the ring gear making the ring gear rotates. Then the wire rope can be pulled out to hook the dragged objects. When the handle goes back to make the dutch lever engage with the braking recesses, the power of the gear mechanism can be transmitted to the wire rope roll drum. The wire rope can be pull back by the power after the rotation of the motor to realize the purpose of dragging objects hooked by the wire rope. However, the operation is arduous and inconvenience since the style of the operation for the clutch handle is up-pulling and the handle is positioned after be pulled up upward and rotated in 90 degrees.

SUMMARY OF THE INVENTION

An object of the present invention is to provide a clutch device for electric winches which has the advantages of saving labor, convenience and safety when using.

To realize the above-mentioned object, a tapered braking device for electric winches in accordance with the present invention is disclosed.

A clutch device for electric winches comprises: a gear box positioned outside of the gear mechanism of the electric winches; an ring gear settled in the gear box and functions along with the gear mechanism; a plurality of braking recesses provided on the outer surface of the periphery of the ring gear; a breaking port provided on the gear box corresponding to the braking recesses; a detachable clutch sleeve fixed on the braking port; a reversed T shaped clutch lever provided in the sleeve, an elastic element bushing on the clutch lever; a clutch handle provided on the sleeve, which connects with the clutch lever by a connection, the clutch handle is operated by rotation, the inner top surface of the clutch handle and the up top surface of the clutch sleeve are cam faces formed by double tapered faces, four flanges are arranged with homogeneous distribution on the periphery of the inner surface, two of the flanges arranged diagonally are relatively shorter, and the other two of the flanges are relatively longer, four flanges form a circle which contains the outer surface of the clutch sleeve, and a rotating-positioning mechanism which can be rotated in 180 degrees is provided between the clutch handle and the clutch sleeve.

The braking port of the gear box is screwed to the clutch sleeve, a tightened screw is provided on the side surface of the braking port of the gear box.

The rotating-positioning mechanism is formed by spring pins which arranged at the two radial sides of the top portion of the clutch sleeve combining the long flanges arranged diagonally on the clutch handle, the outer end of the spring pins extend outward a length.

The amount of the braking recesses provided on the outer surface of the periphery of the ring gear is 4 to 12.

Compared with the prior art, in the present invention, the style for operating the clutch handle is changed from the up-puffing operation to the rotating operation. It only needs to rotate the clutch handle in clockwise and anticlockwise at 180 degrees by the principle of the cam faces construction formed by double tapered faces, so that the clutch handle can be positioned in two directions. It has the following advantages: simplifying the construction, saving the labor and convenient and safe during the operation of the clutch device, operation miss and the lock of the clutch will not be appeared during the usage, accordingly extending the service life, which has the exceeded purpose to the development of the clutch device for the electric winches.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a structural exploded view of a clutch device for electric winches according to the present invention;

FIG. 2 is a structural view showing the disengaging state of the clutch device for electric winches according to the present invention;

FIG. 3 is a structural view showing the engaging state of the clutch device for electric winches according to the present invention;

FIG. 4 is a structural sectional view of the clutch sleeve;

FIG. 5 is a view showing the relationship of the position between the clutch device and the double tapered braking device in the electric winches (disengaging state of the clutch device);

FIG. 6 is a view showing the relationship of the position between the clutch device and the plane braking device in the electric winches (engaging state of the clutch device).

DETAILED DESCRIPTION OF THE INVENTION

The following is the detailed description of the embodiment of the present invention in connection with the appended drawings.

As shown in FIGS. 1-4, a clutch device for the electric winches comprises a gear box 7 positioned outside of the gear mechanism of the electric winches; a ring gear 8 is settled in the gear box 7 and functions along with the gear mechanism; eight braking recesses 81 are provided on the outer surface of the periphery of the ring gear 8; a breaking port 71 is provided on the gear box 7 corresponding to the braking recesses 81; a clutch sleeve 3 with outer screw thread, is installed rotatablely in the screw of the braking port 71 and is fixed by a tightened screw in a side screw hole 72, to realize the purpose of the detachable fixed connection. The top surface of the clutch sleeve 3 is a cam face 31 formed by the double tapered face. A pair of pin holes 32 is symmetrically provided at both of the radial sides of the top portion of the clutch sleeve 3, to match tightly with spring pins 4. The outer ends of the spring pins 4 are extended outward 1 mm from the hole.

The inner hole of the clutch sleeve 3 is a step construction. A reversed T shaped clutch lever 6 is provided in the sleeve 3, which can be inserted into the braking recesses 81. An elastic element 5, for example a pressed spring, is bushing on the clutch lever 6. A clutch handle 2 is provided on the clutch sleeve 3. The clutch handle 2 is connected with the clutch lever 6 by a connection 1, a round-headed inner hexagon screw. The inner top surface of the clutch handle 2 is a cam face 21 formed by the double tapered faces, which engages with the cam face 31 of the up-top surface of the clutch sleeve 3 formed by double tapered faces. The clutch lever 6 will be engaged or disengaged with the braking recesses 81 of the ring gear by rotating the clutch handle 2 in clockwise or anticlockwise direction to lift and drop the clutch lever 6. Four flanges are arranged with homogeneous distribution on the periphery of the inner surface of the clutch handle 2. Two of the flanges arranged diagonally are short which settled on the inner top face. The other two of the flanges are long, which provided from the inner top face to the bottom. These four flanges form a circle which contains the outer surface of the clutch sleeve 3.

A rotating-positioning mechanism which can be rotated in 180 degrees is provided between the clutch handle 2 and the clutch sleeve 3. The rotating-positioning mechanism is formed by spring pins 4 which are provided at both of the radial sides of the top portion of the clutch sleeve 3 combining with the diagonal long flanges which are provided on the periphery of the inner surface of the clutch handle 2. When the clutch sleeve 3 is rotated, two spring pins 4 are fixed by the connection with the two long flanges of the clutch handle 2.

When the clutch handle 2 is rotated in anticlockwise direction at 180 degrees, since the difference between the two inclines of the cam faces which is formed by the double tapered faces at the top end of the clutch sleeve 3 and inner top face of the clutch handle 2 changes from lower to higher, so that the clutch lever is made to be disengaged from the braking recesses 81 of the ring gear 8 to realize the disengage function of the clutch device. The clutch lever is limited to be positioned by the positioned construction which constructed by the spring pins on the clutch sleeve and the diagonal long flanges which are provided on the periphery of the inner surface of the clutch handle 2. When the wire rope is pulled out at the disengaging state, the gear mechanism and the ring gear associated with the gear mechanism are rotated freely, so that the wire rope can be pulled out laborsaving to hook the dragged objects. On the contrary, when the clutch handle 2 is rotated in clockwise direction at 180 degrees, the difference between the inclines is changed from higher position to lower, so that the clutch lever is made to be engaged with the braking recesses 81 of the ring gear 8 to realize the engaging function of the clutch device. The clutch lever is also limited in position by the positioned construction which consists of spring pins and diagonal long flanges. At this time, the power of the gear mechanism can be transmitted to the wire rope roll drum. Therefore, after the rotation of the motor, the wire rope can be pulled back via the power to realize the purpose for pulling back the hooked object.

The installation view and the view showing the relationship of the position between the clutch device and the double tapered faces, the plane faces braking device in the electric winches separately are as shown in FIG. 5 and FIG. 6. 

1. A clutch device for electric winches comprises: a gear box (7) positioned outside of the gear mechanism of the electric winches; an ring gear (8) settled in the gear box and functions along with the gear mechanism; a plurality of braking recesses (81) provided on the outer surface of the periphery of the ring gear; a breaking port (71) provided on the gear box corresponding to the braking recesses 81; a detachable clutch sleeve (3) fixed on the braking port; a reversed T shaped clutch lever (6) provided in the sleeve (3); an elastic element (5) bushing on the clutch lever (5); and a clutch handle (2) provided on the sleeve (3), which connects with the clutch lever (5) by a connection (1), wherein, the clutch handle (2) is operated by rotation, the inner top surface of the clutch handle (2) and the up top surface of the clutch sleeve (3) are cam faces (21,23) formed by double tapered faces, four flanges (22) are arranged with homogeneous distribution on the periphery of the inner surface, two of the flanges arranged diagonally are relatively shorter, and the other two of the flanges are relatively longer, these four flanges form a circle which contains the outer surface of the clutch sleeve (3); and a rotating-positioning mechanism which can be rotated in 180 degrees is provided between the clutch handle (2) and the clutch sleeve (3).
 2. The clutch device for electric winches as claimed in claim 1, wherein the braking port (71) of the gear box (7) is screwed to the clutch sleeve (3), a tightened screw is provided on the side surface of the braking port (71) of the gear box (7).
 3. The clutch device for electric winches as claimed in claim 1, wherein the rotating-positioning mechanism for the clutch handle (2) and the clutch sleeve (3) is formed by spring pins (4) which arranged at the two radial sides of the top portion of the clutch sleeve (3) combining with the long flanges arranged diagonally on the clutch handle (2), the outer end of the spring pins (4) extend outward a length.
 4. The clutch device for electric winches as claimed in, claim 1 wherein the amount of the braking recesses (81) provided on the outer surface of the periphery of the ring gear (8) is 4 to
 12. 